Paul
Use whatever you do at Haddo
The fish in insch dont fight as well as Mikes' and they are generally smaller
Only take the big gun if there is a real wind blowing, Insch is quite exposed in places and you may need the extra effort.
Go for fun, i have never been under gunned with my 3 wt out there,(haven't been for a while) mind you back then they had lots of really cracking fish, its not quite the same these days apparently.
Have fun and remember the trout are just trout, nymphs and dries will work as well there as anywhere. Dont reach for the christmas decorations just yet, its only october
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Sandy